The USA Hockey rule book does not give a specific length, it only states that periods can not be longer than 20 minutes. So it will depend on the level (whether it is rec or travel) and the location of the game. Each state/local affiliate will have their own rules. It will also depend on whether it is a running time or stop time game.
From my experience, with an hour long time slot, Mites will normally play 10-12 minute stop time periods or 15 minute running time periods.
Stop time games will also sometimes determine the length of the 3rd period based on how much time is left on the curfew. For example a "12/12/half" game would have 12 minutes for the 1st and 2nd period and then the 3rd period would be half of the time remaining on the ice curfew.
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